As such, the project is highly anticipated and under unbridled fan scrutiny (see: reaction to Apocalypse). Director Bryan Singer succeeded in merging the prequels with the original X-Men films in Days of Future Past, but can he now cleanly - and satisfyingly - bring them to a close? Whatever the answer, he certainly isn't hiding from fans, having become known as much for his directorial style as for his frequent social media updates. Before shooting even began Singer teased concept art, scenes, and new (recast) characters from the film. But it seems the time for clues and hints may finally be over.

Bryan Singer took to Instagram yesterday and announced that production on X-Men: Apocalypse - the main unit work, at least - has officially finished. Check out the photo below, which includes a look at another of the film's massive practical sets.

As you can tell, the image reveals a large structure - likely an Egyptian monument or even the X-mansion - with an unknown woman standing inside (as you can glimpse on the production monitors). While there are no clearly identifiable indicators, the woman could possibly be Rose Byrne's character, Moira MacTaggert, the CIA agent and mutant ally introduced in 2011’s First Class. Professor Xavier wiped portions of Moria's mind at the end of First Class- and the character did not make an appearance in DOFP - so it will be interesting to see how Apocalypse reintroduces the character and handles the repercussions of her memory loss. Whatever the case, writer Simon Kinsberg already confirmed that she will play a "significant" role in the movie.

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And for those unfamiliar, the second unit of production is a discrete team tasked with shooting shots or sequences separate from the main unit. While its functions vary, said unit generally films "pick-ups," including close-ups, cutaways, and establishing shots, as well as action sequences with stunt performers. That said, the bulk of Singer's - and the main cast's - work is complete, which can only mean it's time to celebrate. Along with the set photo above, Singer also shared a list of custom, comic-inspired cocktails offered at the film's wrap party yesterday evening. The menu includes drinks called The Nightcrawler, The Mystique, and The Apocalypse, among others.

With main production officially complete, fans should expect the first trailer for the film in a matter of months. And considering 20th Century's Fox's doomedFantastic Fourfranchise, the studio will most likely want to market Apocalypse rather aggressively to make up for the un-fantastic flop.

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X-Men: Apocalypse opens in theaters in the U.S. on May 27, 2016; Deadpool on February 12th, 2016; Gambit on October 7th, 2016; Wolverine 3 on March 3rd, 2017; Fantastic Four 2 on June 9th, 2017; and some as-yet unspecified X-Men film on July 13th, 2018. The New Mutants is also in development.